What is the best enchantments for PvP? [closed]

Screw helmet and boots, they aren't needed. As for chest plate and leggings: Protection 4 and Projectile Protection 3-4. This will make snipers deal hardly any damage at all and melee deal low damage.

As for your weapon, if your server has mcmmo use a axe. Anyways:

Sword: Fire Aspect 2, Knockback 2, Sharpness 5
Axe: Fire Aspect 2, Sharpness 5.

All these need a anvil and most need enchanted books so it isn't cheap.

This is the best PvP gear possible. The shoes and hat won't do anything against attacks on top of all that Protection 4 – two pieces is maxed out.